Drone+Lead uses duo mode with oscillator 2 as a drone tuned to E. Oscillator 2 plays a lead sound. Use aftertouch for vibrato and the mod wheel for vibrato speed. Use oscillator 2 FREQUENCY control to set the key of the drone (mid position is C). Also use the octave and waveform settings of OSC 2 to vary the drone. Use OSC 2 in the mixer to control the drone level.